FI117748B - The lid of the package, the method of its manufacture and the sealed packaging - Google Patents

The lid of the package, the method of its manufacture and the sealed packaging Download PDF

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Publication number
FI117748B
FI117748B FI20012000A FI20012000A FI117748B FI 117748 B FI117748 B FI 117748B FI 20012000 A FI20012000 A FI 20012000A FI 20012000 A FI20012000 A FI 20012000A FI 117748 B FI117748 B FI 117748B
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FI
Finland
Prior art keywords
lid
characterized
layer
polymer
package
Prior art date
Application number
FI20012000A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20012000A0 (en
FI20012000A (en
Inventor
Tapani Penttinen
Risto Salminen
Original Assignee
Stora Enso Oyj
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Publication date
Application filed by Stora Enso Oyj filed Critical Stora Enso Oyj
Priority to FI20012000 priority Critical
Priority to FI20012000A priority patent/FI117748B/en
Publication of FI20012000A0 publication Critical patent/FI20012000A0/en
Publication of FI20012000A publication Critical patent/FI20012000A/en
Application granted granted Critical
Publication of FI117748B publication Critical patent/FI117748B/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard

Description

117748

BACKGROUND OF THE INVENTION The present invention relates to a heat sealable and detachable lid for the mouth of a package comprising a layer of fibrous material, a polymeric oxygen barrier layer and a polymeric heat sealing layer. The invention further relates to a method of manufacturing a lid, a method of making a lid sealed packaging, and a sealed packaging thus obtained.

Heat-sealed, removable lids are used in a variety of consumer packaging. Typical such packages are consumer and portion packs for liquid, moist or greasy food ingredients. Examples of products to be packaged include milk, filings, yoghurt and other dairy products, juices, water, desserts, edible fats such as butter and margarine, as well as meals. Dry, powdered or particulate products such as pharmaceuticals are also packaged in a similar manner.

The packaging container or container sealed by the heat sealed lid is mostly made of plastic, such as polypropylene or polystyrene, polymer coated paperboard or glass. The material used for the lid is aluminum, which however has the problem that it tends to rupture when opened and, moreover, is indestructible in the landfill. As an alternative, the cover material used to avoid the problems mentioned is polymer-coated paper or board. The polymer sheaths on the lid provide sufficient mechanical strength, the oxygen and aroma protection required by the packaged product, and the heat sealability of the lid upon sealing and the release of the packaging when the container is opened.

• ·· • · • • • Il t ’··. Polymer-coated packaging lids have been made by first making a polyethylene terephthalate film laminated with a heat sealing lacquer, which is then attached by gluing to paper or board. However, such a two-step process, ... * in which the polymer film is mentioned as an intermediate, is difficult to use.

WO 92/04187 describes a process for producing a heat sealable and removable package lid by applying overlap of a polymeric coating. polymer layers on paper in a single step by coextrusion. The coating * · · 30 consists of a binder layer, an oxygen barrier layer, a second adhesive layer • · * - · ', and a heat sealing layer, which is on the bottom of the paper ** * inside the cover, in that order. As the materials of the oxygen barrier layer, the publication mentions polyethylene terephthalate (PET), an ethyl vinyl alcohol copolymer

♦ · · I

(EVOH) and polyamide (PA). The heat sealing layer is shown to be a blend of 2 117748 containing methacrylic acid and ethyl vinyl acetate modified polyethylene as an adhesive component and ethyl methacrylic acid copolymer as a release component. FI-A-104 887 further discloses a polymer-coated package lid which solves the problem of curling of the lid of WO 92/04187 by mixing crystalline and amorphous polymer in an oxygen barrier layer. The triple wire coating described in the publication comprises an oxygen barrier layer, a binder layer and a heat seal layer on the inner surface of the paper, respectively.

The object of the present invention is to provide a polymer-coated paper or board, a heat sealable and removable packaging lid, which can be produced by a single step coextrusion of the polymer layers and which allows the number of overlapping polymer layers to be reduced. The invention is characterized in that the heat sealing layer consists of a polymer blend containing 1-10% ethylene methyl acrylate copolymer 15 (EMI), 20-35% ethyl vinyl acetate copolymer (EVA), and 0.5-5% polyamide dihydrate, the remainder of the mixture being directly an oxygen barrier layer with a higher melting point without any intermediate binder.

In accordance with the invention, it has thus surprisingly been found that said heat seal layer polymer blend, as such, is adherent to the most commonly used ... oxygen barrier polymers, i.e., polyethylene terephthalate, ethyl vinyl *, *; *, alcohol copolymer or polyamide, * · * Point difference. Thus, a prior art polymeric binder layer between the oxygen barrier layer and the heat sealing layer is not required.

The blend of EMA, EVA, and polyamide wax used in accordance with the invention has been found to heat-seal to a wide variety of materials, such as plastic, polymer-coated or uncoated paper or board, and glass.

!, · [: A particularly preferred embodiment of the invention is a heat-sealable closure sealed with a polyester, such as PET, a cardboard freezer, oven flow or cup, which has been problematic with prior heat sealing materials.

• ·

Heat sealing can be carried out at temperatures where the oxygen barrier layer remains unbound so that no leakage that reduces the shelf life of the product occurs through the heat seal. The sealed package has been found to withstand freezing without the • • cover being removed or the heat seal becoming leaky.

3, 117748

According to the invention, the proportion of polyamide wax in the heat seal layer polymer blend is 0.5-5%. EVA in the blend is 20-35% and EMA in the 1-10%.

The remainder of the blend consists of a polyolefin such as polyethylene or polypropylene.

In the cover according to the invention, the polymer coating may advantageously be a two-layer coating comprising only said oxygen barrier and heat seal layers. However, if necessary, the oxygen barrier may consist of multiple layers of different barrier polymers, such as, for example, bonded EVOH and PA layers.

If the material of the oxygen barrier layer is PET or PA, its layer weight may range from 10 to 70 g / m2, most preferably from 20 to 40 g / m2. If the oxygen barrier material is EVOH, the basis weight may be in the range of 5-25 g / m 2, most preferably 10-20 g / m 2. The weight of the caulking layer, in turn, can be 5-30 g / m 2, most preferably 10-20 g / m 2.

According to the invention, the fibrous material layer may be paper weighing 30-120 g / m 2, preferably 40-80 g / m 2, or cardboard, weighing 130-600 g / m 2, preferably 220-300 g / m 2. The paper-based lid is suitable for sealing a smaller mug or goblet, while the paper-based lid is suitable especially for the inside of the box-shaped packaging.

, ···. For the process of the invention, the heat-sealable and bulk-water, ··· described above. characterized in that the fibrous material is • · coextruded with two "*" polymeric layers adhering to the fibers and one to form an oxygen barrier layer and one to form a heat sealing layer to release the lid, * * 25 consisting of a polymer blend containing EMA and EVA and a percentage of polyamide .. * wax blended at the above percentages with the remainder of the blend being polyolefin .The polymer layers can be extruded as continuous films onto a moving fibrous material web, and separate covers are subsequently formed. *** by cutting or stamping.

• · · «...

The method of making the sealed package according to the invention comprises "** J essentially heat sealing to the mouth of the package a lid comprising a fiber, V core material, a polymeric oxygen barrier layer, and an oxygen barrier layer adhered directly to the sealant without any intervening binder. a heat sealing layer containing the above percentages of EMA and EVA and 4,117,478 wax of polyamide, the remainder of the polymer blend being polyolefin, which allows the lid to be opened when the package is opened. The heat sealing temperature may range from 150 ° C to 190 ° C. does not perforate an oxygen barrier layer made of PET, EVOH or PA with melting points above 160 ° C.

The sealed package according to the invention is characterized in that it comprises a container, a packaged product contained in the container and a heat sealed lid at the mouth of the container consisting of a fiber material layer, a polymeric oxygen barrier layer below, containing the above-mentioned percentages of EMA and EVA and polyamide diva mixed together with the remainder of the polymer blend consisting of polyolefin and allowing the lid to be opened when the package is opened. In the food packaging of the invention, such as beverage, dairy, edible fat or meal packaging, the container is typically a box or goblet of plastic or inner and / or outer polymer-coated cardboard. In carton-type packages, as well as packages in which the packaging container or container is made of glass, the heat-sealed lid is typically an inner, removable inner lid of the outer, rotatable or snap-on outer lid.

The invention will now be described in more detail with reference, first, to the accompanying drawing, in which: ··· ♦ Fig. 1 illustrates a drinking cup with a lid according to the invention. Fig. 2 is a larger cross-sectional view of the mouth of the cup shown in Fig. 3 and 4, showing the heat sealing joint of the lid and the lid, Figs. 3 and 4 showing the layer structures of the lid in two different material combinations; in the lid manufacturing process.

*: Figure 1 shows an example of the invention with a product package formed by a

* * V

a drinking cup 2 with square 1. The contents of such a package 3 are typically water, • ·. 30 juices, milk or milk products such as yogurt. The lid 1, as shown in Fig. 2, is heat sealed to the edge flange 4 of the cup 2 and includes a flap 5 from which the lid can be removed by pulling the lid to open the package.

5, 117748

The three-layered structure 6-8 of the lid 1 shown in Fig. 2 is exemplified by Figs. 3 and 4. The lid comprises a paper layer 6 having a weight of e.g. 40-80 g / m2 and forming the outer surface of the lid 1 in the package. According to Figure 3, the inner polymer coating of the lid consists of a PET layer 7 having a weight of e.g. 20 to 40 g / m 2 and a heat sealing layer 8 which forms an inner surface of the lid 1 in the package and e.g. The composition of the heat seal layer 8 of the example is 0.5% to 5% by weight of polyamide wax, 1 to 10% of EMA, 20 to 35% of EVA, and the remainder of polyolefin. A suitable material for the heat seal layer 8 is the product marketed by Rohm & Haas, Mormelt 10,804, having a density of 0.955 g / cm 3, a melting point of 74 ° C and a melt index of 45-55 g / 10 min.

The layer combination of lid 1 according to Fig. 4 differs from that shown in Fig. 3 only in that the material of the oxygen barrier layer 7 is EVOH, which may have a basis weight of e.g. 10-20 g / m 2 instead of PET.

The lid materials of Figs. 3 and 4 are suitable not only for plastic or coated carton mugs or cups of Figs. 1 and 2, but also for plastic or cardboard carton packages, in particular for the removable inner lid of the package or the removable inner lids of the glass can. In the inner lids of the boxes it may be advantageous to use paperboard having a weight of, for example, 220-300 g / m2 instead of paper 6.

According to Fig. 5, the cover material is produced in a continuous process in which the polymeric oxygen barrier layer 7 and the polymeric heat sealing layer 8 are tested: ***: extruded into a continuous moving paper or board web 6. The web 6 is pre-treated with corona treatment 9. Polymer layers 7.8 being brought together in the extruder • · · and guided from the nozzle head 11 as a single diaphragm 12 to the sink between the rolls 13, 14 of paper, ... · 25 or the tapered web 6 so that the rolls * · to each other. The process thus produces * * a cover material in the form of a continuous web 15, from which the individual package lids are removed by cutting or stamping.

* · * • · ·

Example 1 * · · ***** 30 Packaging paper weighing 90 g / m was coextruded with a PET layer, "**: 20 g / m 2, and top with a heat seal (Mormelt 804)." Weight of 15 g / m 2 The resulting polymer coated paper was cut into a cap made of polystyrene edible fat box, the lid was fixed to the mouth of the box by 4 ° * by heat sealing for 2 sec and sealing temperature of 6 117748 175 ° C. A tight seal was provided between the polystyrene and the Mormelt heat sealing layer, and when the box was opened, the lid could be pulled open from the box's mouth.

The experiment was repeated with the same end result in packaging boxes made of polyethylene and polypropylene.

Example 2

The polymer-coated wrapping paper obtained in Example 1 was cut into a piece which was heat sealed to the mouth of a glass can to cover it. The heat sealing time was 2 sec and the temperature 175 ° C. During sealing, the Mormelt layer on the lid was firmly adhered to the glass surface of the mouth of the can, and when the can was opened, the lid could be pulled open from the mouth of the 10 can.

Example 3

The packaging board, weighing 255 g / m 2, was coated with a 40 g / m 2 PET layer, and this coated cardboard was made by nibbling the dietary fat box so that the PET layer became the inner surface of the box. The same packing carton was also coated by coextruding a 20 g / m 2 PET layer and, on top, a heat sealing layer (Mormelt 804) 15 g / m 2. This double-layered cardboard was cut into a piece which was heat sealed to the mouth of a dietary fat box with a sealing time of 2 sec ... and a temperature of 175 ° C. During sealing, the Mormelt heat seal layer adhered • »'···' to the PET coating of the 20 flange edge flanges, and when the box was opened, the lid could be pulled off loosely from the mouth of the box.

*: · · · · · ···: The experiment was repeated with the same result with a box made of uncoated packaging board.

It will be apparent to one skilled in the art that the embodiments of the invention are not limited to the exemplified above, but may vary within the scope of the following claims.

♦ · • · • 1 1 1 1 1 1 1 1 1 ♦ ♦ ♦ ♦ ♦ 1 · 1 ♦ ♦ ♦ 1 1 «♦ ♦ ♦ 1 1« ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦

Claims (17)

  1. A lid (1) which can be heat-sealed to the opening of a package (2) and is pulled off completely when the package is opened, comprising a fibrous material layer (6), an polymeric oxygen layer (7) and a heat seal layer (8) of polymer , characterized in that the heat sealing layer (8) consists of a polymer blend containing 1-10% ethylene methyl acrylate copolymer (EMA), 20-35% ethylene vinyl acetate copolymer (EVA) and 0.5-5% polyamide wax, while the rest of the mixture consists of polyolefin, and that the heat seal layer has been bonded directly to the oxygen barrier layer (7) with a higher melting point without any intermediate binder.
  2. 2. A lid according to claim 1, characterized in that the polymer coating on the fibrous material (6) consists only of said oxygen barrier and heat seal layer (7,8). v
  3. A lid according to claim 1 or 2, characterized in that the polymer in the oxygen barrier layer (7) is polyethylene terephthalate (PET), ethyl vinyl alcohol copolymer (EVOH). and / or polyamide (PA). • · * • · * • * * ··· * 20
  4. 4. A lid according to claim 3, characterized in that the oxygen barrier layer of PET or PA has a weight in the range from 10 to 70 g / m2, preferably from 20 to 40%. g / m2.
  5. * ». ···. A lid according to claim 3, characterized in that the oxygen barrier layer of EVOH has a weight in the range from 5 to 25 g / m2, preferably from 10 to 20 g / m2. • Lj.i 25
  6. A lid according to any of the preceding claims, characterized in that the heat: [**: sealing layer (8) has a weight in the range of 5 to 30 g / m2, preferably from 10 to 20 g / m2. * ·
  7. Cover according to any of the preceding claims, characterized in that the fibrous material layer (6) is made of paper with a weight within the ranges from 30. · /; 30 to 120 g / m 2, preferably from 40 to 80 g / m 2. • · · • · 10 1 1 7748
  8. Cover according to any of claims 1-6, characterized in that the fibrous material layer is made of cardboard with a weight in the range from 130 to 600 g / m2, preferably from 220 to 300 g / m2.
  9. 9. A method of manufacturing a lid (1) which can be secured by heat sealing and which can be pulled as completely out of its joint location as defined by any of the preceding claims, characterized in that the fibrous material (6) is coated. by single-stage coextrusion with two polymer layers (7, 8) adhering to the fibers and each other, one of said layers forming the oxygen barrier layer (7) and the other forming the heat seal layer (8), allowing the cover to be pulled off and later consists of a polymer blend containing 1-10% ethylene methyl acrylate copolymer (EMA), 20-35% ethylene vinyl acetate copolymer (EVA) and 0.5-5% polyamide wax, while the rest of the mixture consists of polyolefin.
  10. Method according to claim 9, characterized in that the polymer layers (7, 8) are extruded as continuous films on a movable fibrous web (6) and that individual lids (1) are separated from the web (15) thus obtained. by cutting or punching.
  11. 11. A method of manufacturing a closed package, characterized in that a lid (1) is heat sealed to the opening of the package (2), the lid comprising a fibrous material layer (6), an oxygen barrier layer (7) of polymer and a heating element. 20 sealing layer (8) attached directly to the oxygen barrier layer without intermediate binder portion, wherein the heat sealing layer consists of a polymer blend containing 1- 10. ethylene methyl acrylate copolymer (EMA), 20-35% ethylene vinyl acetate copolymer. EVA) and 0.5-5% polyamide wax, while the remainder of the mixture consists of poly (*): lefin and allows the lid to be pulled off completely when the package is opened. • ♦ ... 25
  12. Method according to claim 11, characterized in that the heat sealing temperature is within the range of 150 to 190 ° C. JJ *:
  13. A closed package made by the method of claim 11 or: ***; 12, characterized in that the package comprises a container, a packaged product, product (3) in the container (2) and a lid (1) heat-sealed to the opening of the container, the lid consisting of a fibrous material layer, an underlying oxygen * φ * polymer barrier layer (7) and a heat seal layer (8) which forms the inner surface of the lid and which is attached directly to the oxygen barrier layer without intermediate adhesive, the heat seal layer consisting of a polymer mixture which contains 1-10% ethylene acrylate copolymer (EMA), 20-35% ethylene vinyl acetate composition 117748 polymer (EVA) and 0.5-5% polyamide wax while the remainder of the mixture consists of polyolefin and allows the lid to be peeled off completely when the package is opened .
  14. Packaging according to claim 13, characterized in that the container is a cardboard box, mug or grounds coated with polymer on the inside and / or the outside. 5
  15. Packaging according to claim 13, characterized in that the container is a plastic box, mug or cup.
  16. Packaging according to claim 13, characterized in that the container is made of glass.
  17. Packaging according to any of claims 13-16, characterized in that it is a sealed Hvsmedel package. * ·· • · »· · ··« • · • · * · 1 • · · • · # · ♦ · · • · · ♦ ♦ 1 · ♦ ♦ »·« ·· e ·. '·. ··· • · · • · # ♦ · · «« 1 • · • · «·· * ···. • · ... # · '· · · · · · · · · · · · · · · · · · · · · 1 ·' - ·· '··
FI20012000A 2001-10-15 2001-10-15 The lid of the package, the method of its manufacture and the sealed packaging FI117748B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FI20012000 2001-10-15
FI20012000A FI117748B (en) 2001-10-15 2001-10-15 The lid of the package, the method of its manufacture and the sealed packaging

Applications Claiming Priority (20)

Application Number Priority Date Filing Date Title
FI20012000A FI117748B (en) 2001-10-15 2001-10-15 The lid of the package, the method of its manufacture and the sealed packaging
US10/492,727 US20040245138A1 (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid
PT02801344T PT1448381E (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid
KR1020047005446A KR100904836B1 (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid
AU2002333924A AU2002333924B2 (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid
ES02801344T ES2269812T3 (en) 2001-10-15 2002-10-15 Container cover, method for the manufacture of the same and sealed container with the cover.
EP20020801344 EP1448381B1 (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid
PCT/FI2002/000805 WO2003033258A1 (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid
CA 2463683 CA2463683C (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid
AT02801344T AT335602T (en) 2001-10-15 2002-10-15 Packaging cover, method of manufacturing therefor and covered with the cover
DK02801344T DK1448381T3 (en) 2001-10-15 2002-10-15 Packaging lids, method of manufacture thereof and packaging closed by said lids
CNB028204611A CN1308137C (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid
JP2003536026A JP4558316B2 (en) 2001-10-15 2002-10-15 Package lid, manufacturing method thereof, and package sealed with the lid
MXPA04003498A MXPA04003498A (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid.
RU2004110937/12A RU2312770C2 (en) 2001-10-15 2002-10-15 Cap of the packing tare, the method of manufacture such cap and the packing tare sealed by it
BR0213650A BR0213650A (en) 2001-10-15 2002-10-15 Packaging lid, method of manufacture thereof and packaging sealed with said lid
DE2002613847 DE60213847T2 (en) 2001-10-15 2002-10-15 Packaging cover, method of manufacturing therefor and covered with the cover
NZ53252902A NZ532529A (en) 2001-10-15 2002-10-15 Package lid, method for manufacturing the same and package sealed with the lid
ZA200401706A ZA200401706B (en) 2001-10-15 2004-03-02 Package lid, method for manufacturing the same and package sealed with the lid.
NO20041665A NO337556B1 (en) 2001-10-15 2004-04-22 Package Lid, process for preparation thereof, method for preparing sealed package and sealed packaging.

Publications (3)

Publication Number Publication Date
FI20012000A0 FI20012000A0 (en) 2001-10-15
FI20012000A FI20012000A (en) 2003-04-16
FI117748B true FI117748B (en) 2007-02-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
FI20012000A FI117748B (en) 2001-10-15 2001-10-15 The lid of the package, the method of its manufacture and the sealed packaging

Country Status (20)

Country Link
US (1) US20040245138A1 (en)
EP (1) EP1448381B1 (en)
JP (1) JP4558316B2 (en)
KR (1) KR100904836B1 (en)
CN (1) CN1308137C (en)
AT (1) AT335602T (en)
AU (1) AU2002333924B2 (en)
BR (1) BR0213650A (en)
CA (1) CA2463683C (en)
DE (1) DE60213847T2 (en)
DK (1) DK1448381T3 (en)
ES (1) ES2269812T3 (en)
FI (1) FI117748B (en)
MX (1) MXPA04003498A (en)
NO (1) NO337556B1 (en)
NZ (1) NZ532529A (en)
PT (1) PT1448381E (en)
RU (1) RU2312770C2 (en)
WO (1) WO2003033258A1 (en)
ZA (1) ZA200401706B (en)

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RU2312770C2 (en) 2007-12-20
FI20012000A0 (en) 2001-10-15
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MXPA04003498A (en) 2004-07-30
BR0213650A (en) 2004-10-26
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EP1448381B1 (en) 2006-08-09
FI117748B1 (en)
FI20012000A (en) 2003-04-16
RU2004110937A (en) 2005-09-27
NO20041665L (en) 2004-04-22
WO2003033258A1 (en) 2003-04-24
FI20012000D0 (en)
NO337556B1 (en) 2016-05-09
DK1448381T3 (en) 2006-12-18
CA2463683A1 (en) 2003-04-24
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JP4558316B2 (en) 2010-10-06
KR100904836B1 (en) 2009-06-25
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EP1448381A1 (en) 2004-08-25
CN1308137C (en) 2007-04-04
US20040245138A1 (en) 2004-12-09
DE60213847D1 (en) 2006-09-21
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KR20040047909A (en) 2004-06-05
AT335602T (en) 2006-09-15
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PT1448381E (en) 2006-12-29
CA2463683C (en) 2010-09-21

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